/* --- Navigation Header pour les Fiches Théoriques --- */

body {
  margin: 0; /* CRUCIAL : Enlève les marges par défaut du navigateur */
  padding: 0;
  background-color: var(--bg-main);
}

header.theory-navbar {
  background: var(--container-bg, #ffffff);
  border-bottom: 2px solid var(--border-color, #cbd5e1);
  padding: 12px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  margin-bottom: 30px;
}

.theory-brand {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--brand-main, #6366f1);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.theory-nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
}
/* --- Boutons de Navigation (Style 3D Cohérent) --- */
.nav-btn {
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 0.85rem;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.1s,
    box-shadow 0.1s,
    background 0.1s;
}

/* Bouton Secondaire (Learn Library) */
.nav-btn-secondary {
  background: var(--brand-light, #e0e7ff);
  color: var(--brand-main, #6366f1);
  border: 2px solid #c7d2fe;
  box-shadow: 0 4px 0 #c7d2fe;
}

.nav-btn-secondary:hover {
  background: #c7d2fe;
}

.nav-btn-secondary:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 transparent;
}

/* Bouton Primaire (Open Visualizer) */
.nav-btn-primary {
  background: var(--brand-main, #6366f1);
  color: #ffffff;
  border: 2px solid #4f46e5;
  box-shadow: 0 4px 0 #4f46e5;
}

.nav-btn-primary:hover {
  background: #5952e6;
}

.nav-btn-primary:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 transparent;
}